Science
Mechanism of Action
This ingredient operates fundamentally through two mechanisms: chelation and pH buffering. As a chelating agent or sequestrant, Dipotassium Phosphate binds to polyvalent metal cations such as iron, nickel, and copper. These metal ions, if left unbound, can catalyze oxidation reactions, leading to product degradation and reduced shelf-life. Concurrently, it acts as a buffering agent, effectively adjusting and stabilizing the pH of water-based formulas. This crucial buffering action prevents undesirable pH shifts that could compromise product integrity and helps to preserve the skin's natural acidic mantle, typically between pH 4.7 and 5.0, thereby supporting the skin barrier's defense against microbes and environmental irritants.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Dipotassium Phosphate is a stable, white, odorless solid. It exhibits hygroscopic properties, readily absorbing moisture from the environment, necessitating proper storage conditions to maintain its anhydrous state. A 1% solution typically presents a pH value between 8.7 and 9.4, often cited around 8.8.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has deemed Phosphoric Acid and its salts, including Dipotassium Phosphate, safe for use in cosmetics under current practices and concentrations, provided formulations are non-irritating. The U.S. FDA recognizes it as Generally Recognized As Safe (GRAS) for food applications, where it serves as an emulsifier, nutrient, pH control agent, sequestrant, stabilizer, or thickener. No specific maximum topical concentration has been stipulated by CIR for Dipotassium Phosphate in cosmetic applications, though other related phosphate salts have defined limits.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Dipotassium Phosphate is a valuable formulation aid, critical for maintaining product stability and supporting optimal skin barrier function through its pH buffering and chelating actions.
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